I will assume that the original post is not a smnmntll bait and will answer as follows:
When I was at school me and a mate, both of us being short of money, shared a set of flippers, one each, for bodysurfing. They worked fine. It's even easier with bodyboarding.

BTW, if you are short of funds, an old pair of stockings wrapped around the flipper and your foot will help save them from falling off. Otherwise velcro straps (called flipper savers) from a surf shop if you have more money.